Cactus House, Rotterdam, Netherlands The Cactus House in Rotterdam within the Netherlands takes its name from its odd shape instead of from the presence of succulent plants. The irregular shape is designed to allow each room to maximize natural sunlight. The odd-sized slabs of concrete additionally enable giant terraces for gardening and for outdoor living. Floating Castle, Ukraine With its single cantilever support, the Floating Castle house in Ukraine seems to be in close danger of tilting over, or maybe collapse. Supposedly the structure was built as a bunker for mineral fertilizers. Yet, its look makes it a suitable backdrop or main setting for a futuristic science fiction feature. Mushroom…